[Libguestfs] increasing HIVEX_MAX_SUBKEYS and HIVEX_MAX_VALUES

[Matt Coleman]

> Do you have the alternate patch that just increases the limits to 1.5x what you need?
I've attached an updated patch that increases the limits based on the counts observed in the Microsoft\Windows NT\CurrentVersion subkey of the software hive.

> We're building a list of (up to) HIVEX_MAX_SUBKEYS * 4 bytes (not counting intermediate blocks) in the _get_children function.  While it's not a massive amount of memory in a modern system, I think if we're going to increase them substantially we should make these limits configurable which makes everyone happy.

Sounds good. I'll start looking at making it configurable.

Matt
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